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https://issues.apache.org/jira/browse/SPARK-22720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16280600#comment-16280600
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Apache Spark commented on SPARK-22720:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/19913
> Make EventTimeWatermark UnaryNode
> ---------------------------------
>
> Key: SPARK-22720
> URL: https://issues.apache.org/jira/browse/SPARK-22720
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> Our Analyzer and Optimizer has multiple rules for `UnaryNode`. After making
> `EventTimeWatermark` extend `UnaryNode`, we do not need a special handling
> for `EventTimeWatermark`.
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